(inorganic chemistry) Either of two oxyanions of iodine; any salt containing these anions

Recurrence of a woman's periods; menstruation. / The quality of being periodic; tendency to recur at regular intervals.

plural of periodical

plural of periodicity

plural of periodization

(transitive) To divide (history) into periods.

simple past tense and past participle of period

present participle of period

plural of periodate

Third-person singular simple present indicative form of periodize